Smith, Alan R.; Kathleen M. Pryer, Eric Schuettpelz, Petra Korall, Harald Schneider, & Paul G. Wolf. A classification for extant ferns(PDF). Taxon. 2006, 55 (3): 705–731 [2008-01-31]. (原始内容存档(PDF)于2008-02-26).引文使用过时参数coauthors (帮助)
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Smith, Alan R.; Kathleen M. Pryer, Eric Schuettpelz, Petra Korall, Harald Schneider, & Paul G. Wolf. A classification for extant ferns(PDF). Taxon. 2006, 55 (3): 705–731 [2008-01-31]. (原始内容存档(PDF)于2008-02-26).引文使用过时参数coauthors (帮助)